Request: CFB mode with 1-byte segment size, useful for streaming (CFB-8 or CFB-1) about aes_frast HOT 2 OPEN

I am sorry to see this now. But I don't think cfb1 and cfb8 is a good idea. For the following reason:

1. This crate has NEVER been conducted. There is no security guarantee.
2. Less feedback size leads to more times to call function to encrypt or decrypt a block. As an estimate, cfb8 is 16 times slower than cfb128, and cfb1 is another 8 times slower than cfb8. I can't tell you if this can improve security and it is worth or not. But I know that in pure Rust-lang code, they will be really slow.
3. In the new cryptography practice, AES CFB and OFB are both not recommended. Maybe CTR or GCM are OK. However AEAD might be the best choice now, which hasn't been supported by this crate.
4. In fact, when I start writing the CFB code, I've considered the custom feedback size problem. At that time I thought it would be very complicate and give up supporting it.

Anyway, I will re-consider this. But I'm not sure whether supporting cfb1 and cfb8 or not. Probably not.

from aes_frast.

In commit d0489f0, I added CFB8 support. The crate version goes to 0.1.4.

from aes_frast.